ProgramNode(0...7)(
  [],
  StatementsNode(0...7)(
    [CallNode(0...5)(
       nil,
       nil,
       (0...1),
       nil,
       ArgumentsNode(2...5)(
         [StringNode(2...5)((2...3), (3...4), (4...5), "\n")]
       ),
       nil,
       nil,
       0,
       "a"
     ),
     CallNode(6...7)(nil, nil, (6...7), nil, nil, nil, nil, 0, "b")]
  )
)
